The mid-infrared is an interesting part of the electromagnetic spectrum composed of colours that cannot be seen by the human eye. Many chemical molecules resonate when illuminated by infrared light. This infrared resonance can then be used to identify or “fingerprint” the molecules. The infrared is, therefore, useful for a range of applications, including atmospheric pollution monitoring, detecting explosives and narcotics, measuring food quality, and many others. However, infrared optical components tend to be large, expensive, and non-tunable.